Hanna-instruments HI 9829 Manual de usuario descargar pdf (Pagina 94)

The calibration solutions and displayed measurements are as ppm Nitrate-

nitrogen. Due to the space restriction of the display the unit of measurement

will be displayed as “ppmNi”

The nitrate sensor will last longer in colder clean waters than in severely

contaminated water or warmer waters. This is because the active chemicals

responsible for the nitrate ion sensitivity are leached out of the membrane with

continued exposure. As the sensor ages there will be a decreased sensitivity until

the sensor will no longer calibrate or operate properly. The lifetime of the sensor

depends greatly on deployment conditions.

Although HI 7609829-12 is selective toward nitrate ions, it also responds to

other ions which can interfere with the measurement. Organic solvents and

cationic detergents must be absent. Chloride has the largest interference for

natural waters.

The ratio of interfering ion to nitrate ion must be less than the ratio indicated

below:

Fluoride: 300 Nitrite: 4

Chloride:100 Iodide: 0.01

Carbonate: 4 Perchlorate: 0.0045

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 103 104

Sin comentarios

Hanna-instruments HI 9829 Manual de usuario Pagina 94